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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13ccf3f2300424a692c6c5371a9869eda92a4878db0f41655ba35dd679a3eb29' 
  AND token = 'wYYvt1RTK1c9NDtD4uuLTqFhNXUML1ubeHlyuHj0OTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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