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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '604a6016dcb22f46aff2e19e5a84ac4d75992ff335109a4f9d1e9c174cbe5a56' 
  AND token = '7ISUqnqLQAya2M4ubWqYY9smws3xPsglSHYJ3dJScCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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