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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7daa449059974c98cdc375defc59e599bd50c7b24577cc6087c301d402f24c50' 
  AND token = '2CGzzRr7YXVPzUCvQgQGQWtxk3MvSyaXoqU5ML5xbeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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