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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a339f83c8a674c510cb1de36461d5f18619fc7c3a541823b04824131279fa408' 
  AND token = 'p7Ivf/yKpCN+rDRCg4rySLni+mjEmFyuika2Md8Y/bU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00146

JSON explain

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