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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '380f57424816fdf56d024155e7ae543e7d321a67bc50b0d16fe52712a0505c37' 
  AND token = 'RMogm6PwrY0/3amQN+3Yyolh2SwKF8lZByyiAEu9P4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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