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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '949bf8d6dfec1fc1ec530af053669544dea39a01aa138c4256db18726568a7ca' 
  AND token = 'bH38pHNXoHeKIY6hv3DctJ2zNn58iGaN+kZv30gSOT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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