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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0616adef9907c6d6daab9db393efbff26a3839e35ba1cf36a084fdb1781b6d24' 
  AND token = 'qia0WsE6wJn9FTm5U7EcezRcLR0gci9OEM9n6uY6O4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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