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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67dda66fe3d7819498c43bddad3b7fe1f58ce00cc9c84c74ecfd0807eb6fd669' 
  AND token = 'fsdCZ0eM96v5XvHu+U9DQh8d0fhHs6P3nHDzc/IXYK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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