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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02a48daf681ff89ab90b7ca7a0280a8a15d7bd552204676a3f2a3efa7352343d' 
  AND token = 'k6wU6cwrRaZapj2ztjKwKlKY9mamU+16LJoYzoDpjZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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