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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce85538dd926c3e09990accfc021566a5f1912510eea1b554cecc53df47df0f0' 
  AND token = 'XOjHIA8f+lh4KTe/pL1vjTxZ3V+BIXuXPc53jC7O5A4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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