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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5090313332ef26edc3461b7c7d9d5a6d6207fdbe6e069e2adb92201509cd0c0' 
  AND token = 'A4ET+7tO1u0ZvrqbqBJQbD/WhZTJPDL5BkhT031RMBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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