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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74055d6f4576a97a8daa36e902f3ad49782fc4a92848cb007c14c02b5357841f' 
  AND token = 'yualZ0R2VK15BbbdVscrHrh4o/c6Cdif6WBfv8RW5vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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