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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9de8aa161f5e32e1fa3800937e89c8e90a7c7a8eef7700fe1d31a78d7ba39bce' 
  AND token = 'ItTGWjrRg+FO/pI7+z9Q4HLjVx2WA3+oNurwERADs4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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