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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '469c5f2235285fb59c7a1e2ef22e831c05482ee5d5a50f969fde93486a9fba96' 
  AND token = 'k88JDhrxOuNiXn61Cd8n8khgq5GJIeU0dpzoOLFce4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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