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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b47fb24307ccd3a73404cdb5c58735d70ed11baf31f9be64c8a47aa5153ad016' 
  AND token = 'UFc33XxYO2JDpaZvF73Jbow94brOU4a5ArKM/YgFmnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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