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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5984856eb2319244310cbf2ed3dfdd55f5826fa99c37c36c4042ef4f7c5c037b' 
  AND token = '91bol5VH0U9sRtcF7NwQ3J7KuI14GHsalbGnRwePt8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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