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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a67dbb8fc4ac9a4c3b7d6432a711fba6f6c5e5798e8d6b24004fc9d0492e46a' 
  AND token = 'jb991bKpVhm3gcgwGOBnSDQZl2Zms4o1r1WlQJNU4k0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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