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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9192a75afe148279d8cf8b9759e771876321f9cbf1313acbcc6508e60d84939f' 
  AND token = 'C3trEqIsTK15jsXQyUmxiuOpwdl3H4lMiLdR9byrn8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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