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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '145d4f52f1182dc3d0ad04468ac4b5765afc681d2008faf11ce825c1b884a1a0' 
  AND token = 'UwzdrAq+FVaiO0K4jY/uJpfTldwBJ59MmnAUpXKOkYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}