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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'affe9c1091ad3f54a7a7b26e9a08f55af6ae5c356a1a4cb19086d3e94a126c70' 
  AND token = 'ncdfsVHjvochPGWkFrBf+z9WUL8WsvNhSZn5wV6GKsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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