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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd598e4c32bcb25d35f47fefe8cba80e7f5eddfb511b85e20dd44c1cdf6886633' 
  AND token = '1OD2WdUm9hVP+Mmmtv7NijAgRZa8z2gT8cUfihsuGzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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