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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fc6e757dbb7d964c4d27facc0beef73bf472aff56958e779ad4d30a5dcd5d80' 
  AND token = 'QxS0tdS12DkUKqA9qU4f/g86D1gMaVgYeat1URsHH9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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