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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0e996efaa509e4f172f305d2c550181ae004b99b0ef9c78b2eda72ae805691b' 
  AND token = 'lnAYIDqiYgD9/jreJL7UXpYNUYoT3viwfPuGyJBJe0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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