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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab2d79898aaa2567d651aedc88f6c07fd5de3473c3cdacc3ffe472a3f9e6fc4a' 
  AND token = 'Jd8EpcAjNrRyNTP1h5yCxdGTZ3UNBaNg8y8PqJzjqdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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