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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f2e96f5c79de3e92fb59b5b5e5ee5e264c85ff7126872c5bef38495cb344e5f' 
  AND token = 'nwRBC6T2IQfFRbNanb6zGT3mVBQrUIQrKGxXqATDN8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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