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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fc1e91f134d70c2680961df6bc6a5b92444ca41cb31d80e07cd74f2d378a146' 
  AND token = 'Vr2OgAd0ktod/hWEweLMdywuI7yrhCYAJnvlYaEYMo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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