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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42827ca856c8e877ea4b8c528dc3e9e30bb06885c1f1112c3125ac8e626b90ca' 
  AND token = 'mO3h9ut1a25h0gEEMtMOgDbaWJy5qaOjumNPeLTx538=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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