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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b728271b86d93bd943c42fc8eae1d91c918107186069efba96260195a4c970ca' 
  AND token = 'ZUdnF6JLinmwlVhMxC8E47TNCTzdIPYn/wjRjhKc2fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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