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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b8417e9f0b54667884207c5ef165f5422a7b5b511e503b491c2c9ac901c5175' 
  AND token = 'dQ1bf8syP7fm1RX72985RzCAGMTGRmJVXpQLzIfwZjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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