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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1956b20e65deeb4aa525783e008afc1a3a2bc14592697ee7cc4de75672cad3ab' 
  AND token = 'yy5fQB52P696Tm4mTGpC7KaUUPo7VmltR6UijsSmQ/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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