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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f22c00c9779c9ad0777e659af371e0a87b7d7abef97c0ab113e72d4a42061e47' 
  AND token = '4RXZlYSR6H3OWIzCP8Ctcax95cbR57fKvgthWUqjb7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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