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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8db8162b5d830e0b6f0814224b82d773b199062ca17a9e66247a47a6716d430' 
  AND token = 'zXZ+h5JzdyT+SQb7oU+Qa7nDsOtr2zHffy7mBEceKO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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