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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e2fcd54f9d5ad1d2bccf7c6ac461099c11361f9016b58242af37537183eadec' 
  AND token = 'St8S/2HgITcmZ2BOIi65U8EZwA/O58ZOIieN/aoXQe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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