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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9db19d4a5084a6250e7377bc4b108896cecfd115a0531f43a568d3d846b847a8' 
  AND token = '6uz9tqavsQqM0GgatUGYCk1QzJI5OxPwgQk3uoctzwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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