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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b8705b50480858b5098aeb5554ed5935057750abb37be489545b2db91969190' 
  AND token = 'TLa1xiGQs1xNZgPiHM2iR3DA+rj47nG3ZJlHQ1N7qz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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