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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bd28dd1ce501f9e79e75fbded02baca0c13e4b24e92c7bbec1fd95d00ebf729' 
  AND token = 'sWP/xXH4BL3hb60FVUROxLxn5s1RUuXrv+0W6uflYzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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