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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd36fe95ba0afcf93f7b3be252285dfb0ade8ca5adab9dfd629412887f7405786' 
  AND token = 'i5kyXSnqa6wG+8Kyz2pYUelipOdR0YSWp6VG6/9ik4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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