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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c584b03fc7f137e38a2762f99fc200b04350519ce6a68aedd6a6e9cc00f38ba7' 
  AND token = 'Xm9ebiD64TQ35QownZSxvTfrllxvThqoBWi80bT8aWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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