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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fe7231ebd7d2b70f0d73e04ae11609482dadba82542a3fc592ed69321771e27' 
  AND token = '5qGbev7i2iu+02MgdLe8VON65gTM9jI5O5ciJmlB4Qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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