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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b50d63c49c358ed4c44a6d05c1cecbacfb3a24d0a70ba4d8df1576c6ddf380ff' 
  AND token = 'c+f+34KEU/165/rwloY9K+/j0BARUfePm4xylyAwuLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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