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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c7ebc95f1ac06fefdd529db5ba0da337871ce5129f6158ae4e0d14041a504b4' 
  AND token = '1jkVLNJT1pz7gGNjtc5q+ceUyWwzVdm4WaoASJphN40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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