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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d829154add1c7a94d14a3495d45ec1be31d327b5288444275b58482dc229165' 
  AND token = 'PoFEQdPzY81SoQTlO/LA78GEmBCY9BL/M+Lrk12GQ+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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