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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e34f7027fcfcea05849d20893a6400f126fc5020279053ba2e19623e17a32170' 
  AND token = 'PaP2TmvnwnKtHZFTYatxplOG46NEncxu6pGYg7HMGSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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