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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f30f4a3face2fb54680219ba14114236fa6c376c9891c2287e6244521bf6e09' 
  AND token = '0Un50rPjAd8YRH9ihLtubiYTtGzF+f7hctXEAEq+e2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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