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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaae2ddeae05b04c2d512041c12d3fab1b03a5b88b0e551ed2f63ec828615f83' 
  AND token = '+F4MU7iIxeALg9OZswA5a8TU+KTONEDBtD0B3Y+cDgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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