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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af4ac1f816c0e6141d9451c9d1bb12f94142c8cfa6af30ff18f6cd3794fa99a8' 
  AND token = 'QeCM5i/CEmiJ8swUcSHFnpENZi/qxe7aA8u/SkwtjLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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