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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3c2ea8122735e6310efaa67a0a42ed3913931698c285b5935aaa0bc758348fd' 
  AND token = '1EPVt1JTbeVXrR/jHL2Infqz2BE12r5s2JPeopRN9dU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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