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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '702915f9bfb42c60c79d5acb8b9c92d57bcb989808c0c3f046b41e78c3265143' 
  AND token = 'pB2uIbcDPjj/60m3rKbddud9G7dDGUaJF3VZOetIf2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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