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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '566ef71ed4a8233ec1ea192a4e35f6b5305888d343cda8e0ac607641a052fff3' 
  AND token = 'fJtKE7Guf6nU5g69sz7+qSx5LpVv3BULHHA83Vaxh+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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