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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15c81e6184199bfdf156e9ef726521f7d70785d98cca845a8fcfa6485c95edab' 
  AND token = 'tyA3AVqDNM8zFFNBvxWtpxec5INZcVhBF2d/tp0/r2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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