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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9262a7168e7c2cc4c623f5c472b9667d68e3b2ea52c6f41f81e4f365f98a8b60' 
  AND token = 'QxveZNUcJ7mHo/n3NTtcMNjFa81GsXW+YqRmXZ1a5Bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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