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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cf43307a834b7b13a7d04a306216157628360f91ba763e39395a0a480e51bf7' 
  AND token = 'pu5cfEba+nCzzOST6YFf0HcMuoMKlsb2bBOdUX8y6ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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