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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '048f3b805044b0c4eddfdfd56c69a052adb7ae0a559dec6430375ee8222c78a6' 
  AND token = 'AUgC0JtxBXRpoU4Ld5jEA7fK83Fc4P2LSmyXQ9l9lZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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