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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f86186e2f39023dc3e36163ecb4547e04342c253b6a44230c98f1f363c3c4b63' 
  AND token = '4m8tTvcSaKZyMgu7nTt3x2ueXmESasxJJ1sOH+erg7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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