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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11e80bb49388d3a1d44729e5038f4ec5eb6440c8e571d7f83250a8d657fc6961' 
  AND token = 'dy+szDvIwW5+baKVEKrOh4OdNca/lNZXy1jpsela6ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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