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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb0097be477feaa21fa9f5dd88e0d47617dd991306f7edcb4389551d025e7b39' 
  AND token = 'BSv8dyn5SBf8KnH0uhWo+nW7a1ULIQBFoU8GLGuDYkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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