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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a9a62caefcbb42b8d282e5d3f01a34b7eccc916ce32ec7cbc054d7a31d9449a' 
  AND token = 'kD+pypDoAiTo9+BKuqAHMRbraFrGD1MXWvRjPZLDklE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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