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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf5c519a77e5e45c19b1ac8a01a25f7523a25017b76e7b3ab7c4eefaa591154c' 
  AND token = 'lo4asBJLWQywmHfn+uUTpHD0Oepb3/4l5d2S2VV70rQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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