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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd36cfe9f7866a5223a6446f5b56f3a45251ea35e9fe69ab54982624a8e25ac6' 
  AND token = 'T39hfKOleWQyn37uphHLkfd5z3Swcc8qK265zNXW7E0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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