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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '550947ca353301d1e01f3d32b0596a5ed22f71fa283d3d2fc638c70902e315fd' 
  AND token = 'CUlqU9SKXcG9YgrFbJHu7j1lLDm230fzaIJzEixKITg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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