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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2716ad0f252e39133e4ed9d82f4f8f01f4d0e62972db9d05799ade702f13b12' 
  AND token = '3g8O0XSKOxaO99BzpWwWv7EQESWPsfBvzDhTDpMZI7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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