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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '698327bd0dfd447a9e5fec336f64a09c01b07c32ddae9b80496996d82d7b679b' 
  AND token = '7d1YONjqbag5s3Acy/Mt6hT9zTRwT4aEYLx3vRTpKVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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